feat: some changes and admin

nextjs/src/app/admin/layout.tsx

@@ -0,0 +1,25 @@
+import type { Metadata } from 'next';
+import type { ReactNode } from 'react';
+
+import Link from 'next/link';
+
+import style from '@/styles/admin.module.scss';
+
+export const metadata: Metadata = {
+  title: 'Admin — Catherine League',
+  robots: 'noindex, nofollow',
+};
+
+export default function AdminRootLayout({ children }: { children: ReactNode }) {
+  return (
+    <div className={style.wrap}>
+      <nav className={style.nav}>
+        <Link href="/">← Site</Link>
+        <Link href="/admin/login">Login</Link>
+        <Link href="/admin/register">Register</Link>
+        <Link href="/admin">Dashboard</Link>
+      </nav>
+      {children}
+    </div>
+  );
+}